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React 19 migration check: does your build actually type-check the affected code? Two small examples worth checking: • An assignment-only ref callback such as ref={el => (node = el)} implicitly returns the node. Use a block body when you intend to return nothing; preserve intentional cleanup functions. • A bare useRef() needs an initial argument under the React 19 types. Choose one that matches the actual contract. A bundler-only build won’t establish that these types are correct. These checks are in AEG’s R19-03. I’m interested in what catches migration problems in real projects—not just what sounds good in a checklist. Does your normal build cover this, or do you run a separate type check?